Powek transmission mechanism



Nov. 20, 19280 1,692,531

ABRAMSON POWER TRANSMISSION MECHANISM Filed July 21, 1927 Patented Nov. 20, 1928.

f nnirsn sta r Es PAT T O CE;

' 5ALEXANDEB AnnAr/isoiu, or Pelican, ccncnosnovaain."

POWER-TRAHmMTTSSIQN lVJIECHANISIVI.

Application filed July 21, 192%), Serial no. 207,528, and in am-ism August lace.

ally arranged bolt or pin rotatably sup orted in the'drivingcasing' and nor'inally held with its part of semi-circular cross section in adjacent angular recesses in the driving wheel shaft iahutinents under sprii'igactlon, in such away that its flattened. side faces tl'leoverrunning flanksot these recesses in the direction of rotation of the driving wheel shafts during forward travel. r

The objecto't this invention to simplify the device by employing as locking member a ball, which is axially guided by means oi a cage held fast in the driving casing, in such a manner that the ball normally projects on both sides of the cageinto the angular recesses, and the line joiningthe apices oi -these recesses passes through the centre of theball. The abutment o each halfaxle which into a condition ol free movement therefore pressesthe ball with the correspondingfianh of its angular, recess in an axial direction into the opposite recess so far that itrbears on both flanks of this recess, and inthis position that aperture in the ball cage whichis opposite to the-freely moving half-axle is shut oil from the straight surface of the abutment of the freely moving halt-axle. The othcrhali-axle is. thereby coupled to the driving casing. After the s'iinul we tane'ous rotation ot'v hi ahut-inents hasbeen normally effected by the common driver connected with the driving casing, the balltaltes up during normal travellingsuch a position that can pass into the recess in either abutment as occasion requires, for the purpose of coupling the latter to the driving casing. I i i I The invention also relates to subjecting this ball to the action of two belts or pins resiliently pressed towards its centre, which take up the axial thrusts which would otherwise be exerted by the ball upon the abutments. These pins pass through holes bored in the abutinents, which open into the angular recesses in the said ahutments, and these pins tend to keep the ball in its central position.

As soon as the ball is thrustto one side by one abutment beginning to inove freely, the ball pushes the corresponding pin sideways parallel to the direction ot the axisinsuch a way that the pin partly enters into a hole bored on the insidev joiitllc driving casing. The hal axle which is continuing todrive is therebv kept in tl };c01lpling positionnot only by tlie co-operat onot' theball with the flanks of the angular recess in. the corresponding ahutinent but also by the pin being pushed partly into the aperture on the inside of the lriving i i ltv l i I In the accompanying drawingstwo constructional tforms of the driving clutch are illustratedi I i Fig. 1 shows a tional form, a v v v I 7 h Fig. 2a longitudinal section on the line in Fig, Land.

Fig. 3 shows the second constructional form in longitudinalsection on an, enlarged scale. The haltaxles 1 and 1 are provided with the zabutincnts 7 and 7 respectively, upon which there acts the common driving pin 6 arranged in the driving casing 10. 'lliellriving casing- 10 is equipped with the. driving gear 3. On the adjacent sides of the abutments 7 and 7 are formed the angular rcce 30. and 30 respectively, v a r 1 v Accordi 11g to the present invention between the ahutrn-ents if and "7 a diametrically ar ranged strip 40 provided in the driving casing, and this strip axially guides a ball ll in an aperture freely located facing the abutments 7 ant 7 and acting as a ball cage. The arrangement is such that when the driving pin 6 acts simultaneously upon the two abutnients 7 and 7; the line oining the apices of the reccsses 3O andElO passes through the centre of thehall ll, and the latter projects beyond the sides of the ,strip4-O in such away that it lies within the range of both the recesses 30 and As will be seen from Figures 1 and 2, the half-axle carrying the ahutinentT has begun to move freely. I

Under these circumstancesthe flank of the recess 30, which is over-running the direction of rotation, has displaced the ball 41 axially into the recess 30, and the ball is held in this position by the solid disc part of the abutment 7 in such a way that the said ball 41 bears against both flanks of the recess 30. The coupling of the half-axle 1 to the driving casing, further subsisting owing to the action of the crosssection of one construc- 

